Found Roomette SEA-LAX for $227 on the following dates:
9 September 2012
6 October 2012
26 October 2012
30 October 2012
31 October 2012
3 Novermber 2012
6 November 2012
8 November 2012
9 November 2012
13 November 2012
22 November 2012
All dates from 27 November 2012 through 17 December 2012.
24 December 2012
25 December 2012
Those are the lowest fares I could find. I hope this info is helpful to you.